Rotational effects in the band oscillator strengths and predissociation linewidths for the lowest {sup 1}{pi}{sub u}-X {sup 1}{sigma}{sub g}{sup +} transitions of N{sub 2}
- Research School of Physical Sciences and Engineering, Australian National University, Canberra, Australian Capital Territory 0200 (Australia)
A coupled-channel Schroedinger equation (CSE) model of N{sub 2} photodissociation, which includes the effects of all interactions between the b, c, and o {sup 1}{pi}{sub u} and the C and C{sup '} {sup 3}{pi}{sub u} states, is employed to study the effects of rotation on the lowest-{upsilon} {sup 1}{pi}{sub u}-X {sup 1}{sigma}{sub g}{sup +}({upsilon},0) band oscillator strengths and {sup 1}{pi}{sub u} predissociation linewidths. Significant rotational dependences are found which are in excellent agreement with recent experimental results, where comparisons are possible. New extreme-ultraviolet (EUV) photoabsorption spectra of the key b {sup 1}{pi}{sub u}<-X {sup 1}{sigma}{sub g}{sup +}(3,0) transition of N{sub 2} are also presented and analyzed, revealing a b({upsilon}=3) predissociation linewidth peaking near J=11. This behavior can be reproduced only if the triplet structure of the C state is included explicitly in the CSE-model calculations, with a spin-orbit constant A{approx_equal}15 cm{sup -1} for the diffuse C({upsilon}=9) level which accidentally predissociates b({upsilon}=3). The complex rotational behavior of the b-X(3,0) and other bands may be an important component in the modeling of EUV transmission through nitrogen-rich planetary atmospheres.
- OSTI ID:
- 20723265
- Journal Information:
- Journal of Chemical Physics, Vol. 123, Issue 21; Other Information: DOI: 10.1063/1.2134704; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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